KLOS, H., & LANG, E. (1982). Handbook of zoo medicine: Diseases and treatment of wild animals in zoo, game parks, circuses and .. Van Nostrand Reinhold.
Lua i Stíl Chicago (17ú heag.)KLOS, Heinz-Georg, agus Ernst LANG. Handbook of Zoo Medicine: Diseases and Treatment of Wild Animals in Zoo, Game Parks, Circuses and .. New Yrok: Van Nostrand Reinhold, 1982.
Lua MLA (9ú heag.)KLOS, Heinz-Georg, agus Ernst LANG. Handbook of Zoo Medicine: Diseases and Treatment of Wild Animals in Zoo, Game Parks, Circuses and .. Van Nostrand Reinhold, 1982.
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